Java Tutorial/J2ME/TextBox
Содержание
- 1 Add TextBox to a form
- 2 Check the input value of a password field
- 3 Display text in TextBox
- 4 Get value from TextField
- 5 Numeric TextField
- 6 Phonenumber TextField
- 7 Remove command from TextBox
- 8 Text Anchor
- 9 TextBox which accepts any input
- 10 TextBox with size
- 11 TextField.PASSWORD
- 12 TextField.PASSWORD | TextField.NUMERIC)
Add TextBox to a form
<source lang="java">
/* License
*
* Copyright 1994-2004 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
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* this list of conditions and the following disclaimer.
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* Neither the name of Sun Microsystems, Inc. or the names of contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
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import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.TextBox; import javax.microedition.lcdui.Ticker; import javax.microedition.midlet.MIDlet; public class J2MEHelloMIDlet extends MIDlet implements CommandListener {
// The exit command
private Command exitCommand;
// The display for this MIDlet
private Display display;
// create a ticker
private Ticker hi = new Ticker("J2ME is cool");
public J2MEHelloMIDlet() {
display = Display.getDisplay(this);
exitCommand = new Command("Exit", Command.SCREEN, 2);
}
public void startApp() {
TextBox t = new TextBox("Hello MIDlet", "Wireless Internet", 256, 0);
t.addCommand(exitCommand);
t.setCommandListener(this);
t.setTicker(hi); // set the ticker
display.setCurrent(t);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
if (c == exitCommand) {
destroyApp(false);
notifyDestroyed();
}
}
}</source>
Check the input value of a password field
<source lang="java">
import javax.microedition.lcdui.Alert; import javax.microedition.lcdui.AlertType; import javax.microedition.lcdui.Choice; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.List; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class LoginMidlet extends MIDlet implements CommandListener {
private Display display;
private TextField userName = new TextField("LoginID:", "", 10, TextField.ANY);
private TextField password = new TextField("Password:", "", 10, TextField.PASSWORD);
private Form form = new Form("Sign in");
private Command cancel = new Command("Cancel", Command.CANCEL, 2);
private Command login = new Command("Login", Command.OK, 2);
public void startApp() {
display = Display.getDisplay(this);
form.append(userName);
form.append(password);
form.addCommand(cancel);
form.addCommand(login);
form.setCommandListener(this);
display.setCurrent(form);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
notifyDestroyed();
}
public void validateUser(String name, String password) {
if (name.equals("name") && password.equals("pass")) {
menu();
} else {
tryAgain();
}
}
public void menu() {
List services = new List("Choose one", Choice.EXCLUSIVE);
services.append("Check Mail", null);
services.append("Compose", null);
services.append("Addresses", null);
services.append("Options", null);
services.append("Sign Out", null);
display.setCurrent(services);
}
public void tryAgain() {
Alert error = new Alert("Login Incorrect", "Please try again", null, AlertType.ERROR);
error.setTimeout(Alert.FOREVER);
userName.setString("");
password.setString("");
display.setCurrent(error, form);
}
public void commandAction(Command c, Displayable d) {
String label = c.getLabel();
if (label.equals("Cancel")) {
destroyApp(true);
} else if (label.equals("Login")) {
validateUser(userName.getString(), password.getString());
}
}
}</source>
Display text in TextBox
<source lang="java">
import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.TextBox; import javax.microedition.midlet.MIDlet; public class TextBoxHelloWorld extends MIDlet implements CommandListener {
private Display display;
private TextBox textBox;
private Command quitCommand;
public void startApp() {
display = Display.getDisplay(this);
quitCommand = new Command("Quit", Command.SCREEN, 1);
textBox = new TextBox("Hello World", "My first MIDlet", 40, 0);
textBox.addCommand(quitCommand);
textBox.setCommandListener(this);
display.setCurrent(textBox);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command choice, Displayable displayable) {
if (choice == quitCommand) {
destroyApp(false);
notifyDestroyed();
}
}
}</source>
Get value from TextField
<source lang="java">
import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class J2METextFieldCapture extends MIDlet implements CommandListener {
private Display display;
private Form form = new Form("Sign In Please");
private Command submit = new Command("Submit", Command.SCREEN, 1);
private Command exit = new Command("Exit", Command.EXIT, 1);
private TextField textfield = new TextField("First Name:", "", 30, TextField.ANY);
public J2METextFieldCapture() {
display = Display.getDisplay(this);
form.addCommand(exit);
form.addCommand(submit);
form.append(textfield);
form.setCommandListener(this);
}
public void startApp() {
display.setCurrent(form);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command command, Displayable displayable) {
if (command == submit) {
textfield.setString("Hello, " + textfield.getString());
form.removeCommand(submit);
} else if (command == exit) {
destroyApp(false);
notifyDestroyed();
}
}
}</source>
Numeric TextField
<source lang="java">
import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class TextFieldNUMERIC extends MIDlet {
protected Display display;
protected void startApp() {
display = Display.getDisplay(this);
Form form = new Form("Item Layout");
form.append("line");
form.append(new TextField("Number", "12345", 8, TextField.NUMERIC));
display.setCurrent(form);
}
protected void pauseApp() {
}
protected void destroyApp(boolean unconditional) {
}
}</source>
Phonenumber TextField
<source lang="java">
import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class TextFieldPHONENUMBER extends MIDlet {
protected Display display;
protected void startApp() {
display = Display.getDisplay(this);
Form form = new Form("Item Layout");
form.append("line");
form.append(new TextField("Phone", "1234567890", 10, TextField.PHONENUMBER));
display.setCurrent(form);
}
protected void pauseApp() {
}
protected void destroyApp(boolean unconditional) {
}
}</source>
Remove command from TextBox
<source lang="java">
import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.TextBox; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class J2METextBoxCaptureRemove extends MIDlet implements CommandListener {
private Display display;
private TextBox textbox;
private Command submit;
private Command exit;
public J2METextBoxCaptureRemove() {
display = Display.getDisplay(this);
submit = new Command("Submit", Command.SCREEN, 1);
exit = new Command("Exit", Command.EXIT, 1);
textbox = new TextBox("First Name:", "", 30, TextField.ANY);
textbox.addCommand(exit);
textbox.addCommand(submit);
textbox.setCommandListener(this);
}
public void startApp() {
display.setCurrent(textbox);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command command, Displayable displayable) {
if (command == submit) {
textbox.setString("Hello, " + textbox.getString());
textbox.removeCommand(submit);
} else if (command == exit) {
destroyApp(false);
notifyDestroyed();
}
}
}</source>
Text Anchor
<source lang="java">
import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Graphics; import javax.microedition.midlet.MIDlet; public class TextAnchorMIDlet extends MIDlet implements CommandListener {
private Command exitCommand;
Display display;
public void startApp() {
Display display = Display.getDisplay(this);
Displayable d = new TextAnchorCanvas();
exitCommand = new Command("exit", Command.EXIT, 1);
d.addCommand(exitCommand);
d.setCommandListener(this);
display.setCurrent(d);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
notifyDestroyed();
}
} class TextAnchorCanvas extends Canvas {
int width = 0;
int height = 0;
public void paint(Graphics g) {
width = getWidth();
height = getHeight();
g.setGrayScale(255);
g.fillRect(0, 0, width - 1, height - 1);
g.setGrayScale(0);
g.drawRect(0, 0, width - 1, height - 1);
g.drawString("TEXT", width / 2, height / 2, Graphics.BASELINE | Graphics.HCENTER);
}
}</source>
TextBox which accepts any input
<source lang="java">
import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class TextFieldANY extends MIDlet {
protected Display display;
protected void startApp() {
display = Display.getDisplay(this);
Form form = new Form("Item Layout");
form.append("line");
form.append(new TextField("Any", null, 8, TextField.ANY));
display.setCurrent(form);
}
protected void pauseApp() {
}
protected void destroyApp(boolean unconditional) {
}
}</source>
TextBox with size
<source lang="java">
import javax.microedition.lcdui.rumand; import javax.microedition.lcdui.rumandListener; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.TextBox; import javax.microedition.midlet.MIDlet; public class TextBoxSizeMIDlet extends MIDlet implements CommandListener {
private Command exitCommand = new Command("Exit", Command.BACK, 1);
private Display display;
public TextBoxSizeMIDlet() {
display = Display.getDisplay(this);
}
public void startApp() {
TextBox t = new TextBox("Hello MIDP", "Welcome to MIDP Programming", 256, 0);
t.addCommand(exitCommand);
t.setCommandListener(this);
display.setCurrent(t);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command c, Displayable s) {
if (c == exitCommand) {
destroyApp(false);
notifyDestroyed();
}
}
}</source>
TextField.PASSWORD
<source lang="java">
import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class TextFieldPASSWORD extends MIDlet {
protected Display display;
protected void startApp() {
display = Display.getDisplay(this);
Form form = new Form("Item Layout");
form.append("line");
form.append(new TextField("Password", null, 8, TextField.PASSWORD));
display.setCurrent(form);
}
protected void pauseApp() {
}
protected void destroyApp(boolean unconditional) {
}
}</source>
TextField.PASSWORD | TextField.NUMERIC)
<source lang="java">
import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; public class TextFieldPASSWORDTextFieldNUMERIC extends MIDlet {
protected Display display;
protected void startApp() {
display = Display.getDisplay(this);
Form form = new Form("Item Layout");
form.append("line");
form.append(new TextField("Password", null, 8, TextField.PASSWORD | TextField.NUMERIC));
display.setCurrent(form);
}
protected void pauseApp() {
}
protected void destroyApp(boolean unconditional) {
}
}</source>
